High-field Behavior in the Electron Doped Superconducting Cuprate La_2-xCe_xCuO₄

We present recent results on the magnetoresistance and Hall effect of La_2-xCe_xCuO₄ (LCCO) in applied fields up to 65 T in the vicinity of the proposed quantum critical point at x_c = 0.14¹. Additionally, at x_c, the T -> 0 K Hall coefficient changes sign in low magnetic fields (B < 14 T) from negative below x_c to positive for higher dopings. It was recently reported in Nd_2-xCe_xCuO₄ single crystals² that the doping where the sign change occurs shifts to lower doping at higher fields. We revisit this trend in LCCO thin films and discuss the possible scenarios.

¹T. Sarkar, et al., Phys. Rev. B 96, 155449 (2017).
²T. Helm, et al., Phys. Rev. B 92, 094501 (2015).